Table 1.
Definitions of countermovement jump variables examined in the present study.
| Variable (Unit) | Description |
|---|---|
| Unweighting phase (s) | The time interval between point a (start of the movement) and point c (start of the braking phase) in the CoM Z-t trajectory. |
| Breaking phase (s) | The time interval between point c (start of the braking phase) and point d (end of the eccentric phase) in the CoM Z-t trajectory. |
| Eccentric phase (s) | The time interval between point a (start of the movement) and point d (end of the eccentric phase) in the CoM Z-t trajectory. |
| Propulsive phase (s) | The time interval between point d (end of the eccentric phase) and point f (take-off) in the CoM Z-t trajectory. |
| Take-off phase (s) | The time interval between point a (start of the movement) and point f (take-off) in the CoM Z-t trajectory. |
| LD eccentric phase (s) | The time interval between point h (landing) and point i (end of the landing phase) in the CoM Z-t trajectory. |
| Flight time (s) | The time interval between point f (take-off) and point h (landing) in the Toe Z-t trajectory. |
| Jump height (m) | Maximum vertical displacement of the CoM relative to the initial resting position. |
| Countermovement depth (m) | Minimum vertical displacement of the CoM relative to the initial resting position during the push-off phase. |
| LD depth (m) | Minimum vertical displacement of the CoM relative to the initial resting position during the landing phase. |
| Max CoM vertical velocity (m/s) | Maximum vertical velocity of the CoM during the movement. |
| Take-off CoM vertical velocity (m/s) | Vertical velocity of the CoM at the moment of take-off. |
| Min CoM vertical velocity (m/s) | Minimum vertical velocity of the CoM during the movement. |
| Ankle dorsiflexion angle (deg) | The ankle dorsiflexion angle during the transition from the eccentric to the concentric phase of the push-off. |
| Knee flexion angle (deg) | The knee flexion angle during the transition from the eccentric to the concentric phase of the push-off. |
| Hip flexion angle (deg) | The hip flexion angle during the transition from the eccentric to the concentric phase of the push-off. |
| LD ankle dorsiflexion angle (deg) | The ankle dorsiflexion angle during the transition from the eccentric to the concentric landing phase. |
| LD knee flexion angle (deg) | The knee flexion angle during the transition from the eccentric to the concentric landing phase. |
| LD hip flexion angle (deg) | The hip flexion angle during the transition from the eccentric to the concentric phase of landing. |
| Jump height from flight time (m) | Jump height calculated based on the flight time. |
| Jump height—CoM take-off velocity (m) | Jump height calculated based on the vertical velocity of the CoM at take-off. |
| Jump height—CoM max. velocity (m) | Jump height calculated based on the maximum vertical velocity of the CoM. |
Note: CoM—center of mass; Min—minimum; Max—maximum; LD—landing.